Welcome! Please sign in or register here Cart items: 0  Total: $0.00
Denkmeier Optical, Inc. is a company co-owned by Russ Lederman and Tony Pirera and located in Hauppauge NY. Russ Lederman is Inventor of The Power x Switch and Power Switch Star Diagonals. Let Denkmeier Optical be your source for the finest Binoviewers, Eyepieces, and Star Diagonals available anywhere.

All new Denkmeier Optical Products are covered by a one year warranty. This covers any problems that may occur during normal use. The warranty is not transferrable and only covers the original purchaser. There is a 30 day return policy for all products. All returns must be accompanied by a copy of the original receipt. Shipping charges are not refundable, A 2.5% retocking fee will apply to all products returned for refund.  

Credit Cards:
Customers using credit cards will be charged the fee that we are charged by our provider, if that credit card is declined when we attempt to charge. Please be accurate when inputting all information and notify your bank who issued the card that a charge will occur. This is especially a requirement for overseas orders. 

November 10th, 2014 DELIVERY UPDATE: 
We will be working on more Binotron-27 Super Systems in late November. Collitron Reticles are in stock. We are coating and assembling more D21 and D14 Eyepiece Pairs as well.  These are complicated systems and Russ and staff assembles and checks and collimates every single Binotron-27 Super System.  We always want to be sure that every Binotron-27 arrives in perfect collimation and conditions so your patience is appreciated as always! 100% QC throughout the process takes time but is well worth it!

10-09-2014 Hey Russ! 

Thanks again for getting the Bino to me so quick. It's an amazing piece of hardware and everybody loved it. Despite having only been used briefly it's been a topic of conversation for days. There is a call request list on the fridge now to alert the locals next time I set up. How to win friends and influence people? Buy a Denkmeier Binotron from Russ Lederman!  

Couldn't be happier! Jim R. - Hilliard, Ohio 

Quick Link to Products
Links Directly Below
BINOTRON-27 Super System "Astronomy Magazine Star Product 2013" 
BINOTRON-27 Super System for SCTs and Refractors
Denkmeier Eyepieces
Power Switch Star Diagonals
IVB Star Diagonal for SCTs, With Filter and Power Switch
Denk Hi-Def Filters
NEW OCS A-45 "Astronomy Magazine Star Product 2014"
"New One-Piece Lunt Optical Adapter
BINOTRON-27 FAQs and Weight Specifications
New Collitron Reticle

VIDEO VIDEO VIDEO NEW * Video Tutorial Links

NEW *Customer's Photos of Their Systems

NEW *BINOTRON-27 Review in Astronomy Magazine

Click On This Link: ALL NEW!! BINOTRON-27
As Seen in Sky&Telescope and Astronomy Magazine 
Introductory Sale for VERY LIMITED NUMBER OF THESE!!!

Latest Delivery Update: 06-30-2013
We will fill ALL orders all orders during the second week of July! Then we expect to reach an "in-stock" status on BINOTRON-27 Super Systems, Eyepieces, Filter Switches, and the brand new IVB Diagonals. e will be testing and delivering both the D14 and D21 Denk Eyepieces as well.  As we assemble and implement 100% quality control procedures, we must take the time necessary to inspect and test at every phase.

Matched Eyepieces
Denk 65 degree AFOV Eyepieces are optically unsurpassed. Our high index glass and super efficient anti-reflection coatings produce amazing images with boosted contrast. Yes, we match our D21 and D14 eyepieces! Each optical set is carefully measured to the tenth of a millimeter for focal length and paired together. Then we test them mechanically in the BINOTRON-27 for a final assessment. We will have stock built by mid July, ready to ship. Try them! We believe these eyepieces to be the finest optical instruments available for use in your new BINOTRON-27 Super System! READ REVIEW

This is the finest binoviewer I have ever seen. Not only does it perform flawlessly, it is a beautifully crafted work of art". - Jon S. , California USA 
Note: Jon is a longtime Denk II Super System user who just took delivery of our latest BINOTRON-27 Super System

Note: We do  not charge customers until we ship though in a few cases, we are requested to charge early. In other words, we must ship to experience income! That notwithstanding, we cannot rush any process and the best thing for the customer and our commpany as well, is an adherence to the strictest quality procedures. This is our mantra and we will stay the course. You, the loyal customer will benefit in the longrun, knowing that your BINOTRON-27 was worked on individually with the greatest care possible!

A MUST for all Wedge and EQ Mounted SCTS!!! NEW IVB 2" STAR DIAGONAL
Features The Denk Patent Pending "Inter-locking Visual Back"

NEW!! The OCS-A45 
"I have noted that on the Catseye Nebula, that I could not see the center star before with the D21s in the Bino before the OCS-A45 and now I can see the center star with the OCS-A45!!!  That is proof positive that it has expanded what you can now see and it is definitely an improvement.  Great job Russ." - Victor  
With the new faster mirrors and their very steep cones, you asked us if we could make a larger front OCS Optic. Well, we have done it. Same low magnification as our lowest power OCS but a full 45mm aperture. We can't make 'em any larger!! click on "The Link" for more info. Recommended for all dobs F/5 and faster!

                       LINK BELOW
     ***See The Denkmeier Facility***
                We Are Professionals!

See The Left Margin of This Home Page Under The Words "View Cart" For More Information or To Place Orders

        Denk Binoviewers                        Denk Hi Def Filters                               Denk Eyepieces            
Filter Switch Systems
Hydrogen Alpha Use

      Filter Switches                               Hydrogen Alpha Optical Adapters                                                     

Power Switch Star Diagonals


Denkmeier Optical, Inc is a U.S.A. Company

Announcing Big Denk Hi-Def Filter Sale! Go to the Denk Hi-Def Filter Page using link at top of page.


A Note To Visitors: There is a lot of information about our Binoviewer systems that can be accessed on this website. Deciding which Denk Binoviewer System is the perfect one for you, especially if you own more than one telescope can be a bit confusing. Now the new Super Systems available in Standard or Denk II Versions make it all simple. The Super System works in virtually all telescopes.  We encourage and welcome you to call us (Contact) with any questions that remain after exploring this website, even if this is just to confirm that you have chosen wisely. We receive calls from all over the world everyday and are happy to help you in the selection process. We know that those of you who are pursuing an understanding and appreciation of the heavens through visual observation expect nothing less than outstanding and trouble-free performance when adding a Denk. Whether you are are just beginning, or a seasoned veteran, we are always willing to spend as much time as necessary to help you take in the wonder that is The Cosmos, "The Denk Way".


"Frequently Asked Questions"

"Important Quality Information!!"

"Customer Comments"

"Our Matched Eyepiece Pairs"

"Star Diagonals"


"Denk Reviews"

USA-Made Prisms Featuring 100% Dielectric Coatings Shipped World Wide to 35+ Countries and Counting!! Add our Matched D21mm and D14mm 65 degree eyepieces. They are guaranteed to  render amazing performance in your Denk. We assemble them right here in the USA.

"The Vast and Mysterious Universe Deserves to Be Viewed With Nothing Less Than a Denk!"
- Anonymous

OK.... I admit it. I said it. But it's true!!! -Russ


We Accept Credit Card Payment From Our Amateur Astronomy Friends From All Over The World! We Provide Systems To Customers In Over 35 Countries On Our Planet Earth!!    



Site Map